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Critical damping of structures with elastically supported visco‐elastic dampers
Author(s) -
Lee Yujin,
Takewaki Izuru,
Uetani Koji,
Inoue Kazuo
Publication year - 2002
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.139
Subject(s) - damper , stiffness , vibration , differential equation , damping torque , structural engineering , differential (mechanical device) , viscoelasticity , physics , mechanics , mathematical analysis , engineering , mathematics , acoustics , direct torque control , quantum mechanics , voltage , induction motor , thermodynamics
This paper presents a new formulation for critical damping of structures with elastically supported visco‐elastic dampers.Owing to the great dependence of damper performance on the support stiffness, this model is inevitable for reliable modelling of structures with visco‐elastic dampers. It is shown that the governing equation of free vibration of this model is reduced to a third‐order differential equation and the conventional method for defining the critical damping for second‐order differential equations cannot be applied to the present model. It is demonstrated that the region of overdamped vibration is finite in contrast to that (semi‐infinite) for second‐order differential equations and multiple critical damping coefficients exist. However, it turns out that the smaller one is practically meaningful. Copyright © 2001 John Wiley & Sons, Ltd.